MediaWiki

Renameuser configuration error

MediaWiki is unable to load the extension Renameuser. Please check that the extension's name is correct and all of its files are properly installed.

Details:
Error reading /var/www/www.ccc-mannheim.de/mediawiki/extensions/Renameuser/extension.json. filemtime(): stat failed for /var/www/www.ccc-mannheim.de/mediawiki/extensions/Renameuser/extension.json.

#0 /var/www/www.ccc-mannheim.de/mediawiki/includes/GlobalFunctions.php(54): ExtensionRegistry->queue()
#1 /var/www/www.ccc-mannheim.de/mediawiki/LocalSettings.php(163): wfLoadExtension()
#2 /var/www/www.ccc-mannheim.de/mediawiki/includes/Setup.php(212): require_once('/var/www/www.cc...')
#3 /var/www/www.ccc-mannheim.de/mediawiki/includes/WebStart.php(92): require_once('/var/www/www.cc...')
#4 /var/www/www.ccc-mannheim.de/mediawiki/index.php(44): require('/var/www/www.cc...')
#5 {main}